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Thanks to the persistent Allison in Tech support I now have a working Copernicus II, my unit was a very old version and it needed to have XSTBY, BOOT, XRST & R2 all tied to VCC. Then it came to life and started sending out NMEA sentences.

To Toni_K
Thanks for your interest. It did indeed turn out to be pin connection changes that were needed.

I have an early copernicus II module, but cannot talk to it.
I have worked through the tutorial l using a USB breakout set for 3.3v and tried Tera Term on a PC and coolterm on a MAC. In both cases I can connect TX to RX and see stuff I type on the keyboard echoed back to the terminal screen.
However when I connect to either TX-B and RX-B or TX-A and RX-A nothing shows on the terminal screen.
I have an active antenna connected, I am doing my test setup in side a house so reception will be a bit iffy, but I reckon I should see something.
Apologies if this comment should be posted somewhere else.

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